Patents by Inventor John L. Hanna

John L. Hanna has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Surface maintenance equipment
    Patent number: 4320556
    Abstract: The present invention provides surface maintenance equipment, such as for sweeping lawns, such equipment including a skirt structure for the debris pickup housing.
    Type: Grant
    Filed: September 12, 1980
    Date of Patent: March 23, 1982
    Assignee: Tennant Company
    Inventors: Paul W. Kimzey, John L. Hanna